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Large & Extra Large Stainless Steel Flat Washers - China Factory Suppliers DIN 9021 Fasteners

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Name: Flat Washer (Fender Washer / Extra Large Flat Washer)
Material: Made from high-quality AISI 304/316 Stainless Steel, known for its corrosion and rust resistance, as well as Q235 carbon steel options.
Standards: Manufactured according to GB/T 97.1, GB/T 96.1, DIN 9021, ISO 7091, ANSI B18.22.1 standards, ensuring superior quality.
Grade: Available in grade A2 (304)/A4 (31stainless steel, and 4.8 grade/8.8 grade for carbon steel options.
Specifications: Ranging from M2 to M64, with customizable options to meet specific requirements.
Surface Treatment: Offered in natural polished or passivation treatment for stainless steel (no coating, corrosion resistant). Carbon steel variants feature electroplated zinc (blue-white/zinc color) and optional hot-dip galvanization for enhanced durability.
Design Features: Engineered with an enlarged outer diameter, high-precision openings, and thickened options. Our washers are designed for corrosion resistance and exhibit a smooth, flat surface for optimal performance.
Applications: Ideal for use in construction engineering, automotive and agricultural machinery, outdoor facilities, general assembly, and electromechanical equipment, this product caters to a wide range of industrial needs.
Delivery Time: Fast shipping within 15-30 days upon advance payment.
Origin: Proudly manufactured in China by experienced suppliers and factories.
Brand: JGD
Minimum Order Quantity: 10,000 pieces, negotiable to accommodate various project sizes.
Samples: Available for evaluation before purchase.
Packaging: Offered in boxed, bulk, pallet, or customized packaging options to suit client preferences.
OEM: Tailored solutions available to meet specific brand requirements.

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    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws01
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    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws01

    Key Features

    Our self-tapping screws are crafted from food-grade 304 stainless steel and treated to achieve metric Grade 12.9 ultra-high strength, overcoming the traditional hardness limitations of standard stainless steel. Featuring a countersunk Phillips head design, these screws can be installed flush with the workpiece surface for a zero-profile finish, making them ideal for precision electronics and architectural decoration. We have optimized the thread geometry for different substrates (metal, wood) to ensure low-torque driving with high-torque clamping, effectively preventing stripping. As a superior alternative to standard Tek screws, these fasteners perform exceptionally well in thin sheet metal connections, providing an intelligent fastening solution that balances aesthetics with high load-bearing capacity.
    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws01
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    Precision Manufacturing Process

    From wire rod to finished product, we strictly adhere to multiple international standards including ISO, DIN, ANSI, and GB. Utilizing multi-station cold forging technology, we ensure shank diameter tolerances are controlled within microns. Threads are formed through a precision thread rolling process to enhance fastening force. For non-standard requirements, we employ optical imaging sorters to reject minute defects like head cracks. In post-treatment, we offer a wide range of surface finishing options: from conventional zinc plating and nickel plating to highly corrosion-resistant Hot-Dip Galvanizing (H.D.G.), as well as decorative polishing and black anodizing. We even provide food-grade passivation treatment, ensuring every screw has a prolonged fatigue life in demanding environments.
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    Transparency & Customization

    As a source factory, we are committed to breaking down the information barriers of traditional trade. From mill certificates for raw materials to hardness grades (covering Grade 4.8 to Grade 12.9, as well as A2-70 and A4-80 marine-grade stainless steel), all test data is traceable. We support full-chain customization: dimensionally, we can adjust thread length and head thickness according to drawings; functionally, we can combine processes like sandblasting, electrophoretic coating (e-coating) , or chrome plating. Whether you need British Standard (BS) fasteners or require a special colored anodized finish, we offer small-batch sampling. This ensures that when you purchase fasteners from us, you not only receive high-quality products but also full transparency and control over the entire process, from material selection to packaging.
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    No Pre-Drilling · Rust Resistant · More Secure

    This stainless steel Phillips countersunk self-tapping screw, with its rust-resistant and corrosion-resistant material, one-step self-tapping design, and aesthetically pleasing countersunk head structure, has become the preferred solution for metal substrate fastening scenarios that is efficient, reliable, and aesthetically pleasing.
    Product Details

    Manufacturing Process

    Manufacturing Process

    Multi Station Cold Heading Technology
    Intelligent Heat Treatment System
    Micron-Level Thread Rolling Process
    Fully Automatic Optical Sorting
    Environmentally Friendly Surface Treatment Line
    Metallographic And Mechanical Joint Laboratory
    Quality Control System

    Quality Control System

    Raw Material Source Locking
    Furnace Number Batch Full Traceability
    Third Party Material Certification
    Process Parameters Open And Transparent
    Salt Spray Test Real Time Monitoring
    International Standard Compliance Declaration
    Flexible Customization Capability

    Flexible Customization

    Customizable head/slot Shapes
    Extreme Application Of Special Materials
    Breakthroughs In Extra Large/Long Specifications
    Integrated Assembly Of Components
    Customizable Surface Treatment Colors
    Personalized Packaging And Labeling
    Technical Service

    Technical Service

    On-Site Failure Analysis
    Selection Calculation And BOM Optimization
    Installation Tool Selection Guidance
    Inventory Management (VMI) Trusteeship
    Free Sample Making And Testing
    International Standard Translation
    Multi-Material Options

    Multi-Material & Full-Size Options

    Our flat washers (including extra-large fender washers) are available in 304/316 stainless steel (A2/A4) and Q235 carbon steel (grades 4.8/8.8). Polished and passivated stainless steel offers natural corrosion resistance for outdoor and marine environments, while galvanized carbon steel provides cost-effective rust protection. With inner diameters from M2 to M64 and customizable outer diameters and thicknesses, they meet diverse fastening needs.

    Oversized Outer Diameter

    Enhanced Pressure Distribution

    Manufactured to DIN 9021 and GB/T 97.1 standards, the oversized outer diameter significantly increases contact area compared to standard washers, effectively distributing clamping pressure to prevent damage or pull-through of soft materials, thin sheets, or slotted holes. Precision inner holes ensure a perfect fit with bolts, providing uniform load distribution for reliable performance.

    Versatility for Bulk Assembly

    Versatility for Bulk Assembly

    These washers install easily by placing them under the nut or bolt head without special tools, simplifying assembly and improving efficiency. Stainless steel versions perform well in humid, salt spray environments, while carbon steel options offer excellent wear resistance. Widely used in construction, automotive, and mechanical equipment, they are ideal for wholesale and bulk factory supply.

    Application Scenarios

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    High-Quality Flat Washer Display

    Frequently Asked Questions

    What materials are your flat washers available in?
    We offer flat washers in 304 and 316 stainless steel (A2/A4) for maximum corrosion resistance, and Q235 carbon steel (grades 4.8/8.8) with galvanized finishes for cost-effective durability.
    Do you follow international manufacturing standards?
    Yes, our oversized flat washers are manufactured according to DIN 9021 and GB/T 97.1 standards, ensuring precision fit and reliable performance across global applications.
    Can I request customized sizes or surface treatments?
    Absolutely. We provide flexible customization for inner/outer diameters, thickness, special materials, and various surface treatment colors to meet your specific project requirements.
    What is the advantage of using an oversized fender washer?
    The oversized outer diameter increases the contact surface area, which helps distribute clamping pressure more evenly. This prevents the bolt or nut from pulling through soft materials like wood or thin metal sheets.
    How do you ensure the quality of high-volume orders?
    We utilize fully automatic optical sorting and maintain a metallographic and mechanical joint laboratory. Every batch has full furnace number traceability and third-party material certification.
    Do you offer technical support for product selection?
    Yes, we provide technical services including selection calculation, BOM optimization, on-site failure analysis, and installation tool selection guidance.